Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72ab0ba597cff35…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 22:31:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6215e3b5f52ccb000f66166506245dca SHA-1: b20569a6dca7c31a02851980a4b73071ea3c4220 SHA-256: b72ab0ba597cff35d47240826695ec6f788a7365bd19f7f4c67dc5b85fd7b0fd
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are related to game hacks and 'free Robux', indicating a likely phishing or scam attempt. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of these links are generated to appear as legitimate content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/431946152/free-robux-human-verification-game-hack PDF link annotation
    • http://perpus.stikesphi.ac.id/repository/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/cheat-engine-btools-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-no-bot-check_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-do-you-get-admin-by-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-use-cheat-engine-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/money-and-ranking-hack-roblox-link_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/robux-hack-dot-net_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A4 22224 bytes
SHA-256: 0cb2d60aa790f404d7964e799887842d031409ddc6eb6857f9c89f7b976ef5cd
font_01_sfnt_off000062ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EE 19336 bytes
SHA-256: 92143470d310579c388343173be6cd05412756600998301cf9713c298b7be504

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